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Occurrence

A coming or happening; as, the occurrence of a railway collision.

Ocean

Of or pertaining to the main or great sea; as, the ocean waves; an ocean stream.

oceangoing

capable of crossing an ocean; used on the high seas; -- used mostly of ships; as, oceangoing vessels.

Oceania

A large group of islands in the south Pacific sometimes including Australasia and the Malay Archipelago.

Oceanic

Of or pertaining to the ocean; found or formed in or about, or produced by, the ocean; frequenting the ocean, especially mid-ocean.

Oceanid

A daughter of the Titans Oceanus and Tethys.

oceanographer

A scientist who studies physical and biological aspects of the seas.

Oceanology

That branch of science which relates to the ocean.

Oceanus

The god of the great outer sea, or the river which was believed to flow around the whole earth.

Ocellus

A little eye; a minute simple eye found in many invertebrates. An eyelike spot of color, as those on the tail of the peacock.

Ocelot

An American feline carnivore (Felis pardalis). It ranges from the Southwestern United States to Patagonia. It is covered with blackish ocellated spots and blotches, which are variously arranged. The ground color varies from reddish gray to tawny yellow.

ocher mutation

A mutation in which the base sequence of one of the codons in the messenger RNA has been converted to UAA. Such a mutation may be conditionally suppressed, as can an amber mutation, by the presence of a special transfer RNA.

Ochlesis

A general morbid condition induced by the crowding together of many persons, esp. sick persons, under one roof.

Ochlocracy

A form of government by the multitude; a mobocracy; mob rule.

Ochotonidae

A natural family of mammals including pikas and extinct forms.

Ochre Ocher

A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors. A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.

Ochreous Ocherous

Of or pertaining to ocher; containing or resembling ocher; as, ocherous matter; ocherous soil.

Ochroleucous

Yellowish white; having a faint tint of dingy yellow.

Octachord

An instrument of eight strings; a system of eight tones.

Octad

An atom or radical which has a valence of eight, or is octavalent.

Octaemeron

A fast of eight days before a great festival.

Octagon

A plane figure of eight sides and eight angles.

octagonal

Having eight sides and eight angles.

octagynous

Having eight pistils or styles; octogynous.

octahedral

Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal.

octahedrite

Titanium dioxide occurring in acute octahedral crystals.

octahedron

A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

octamer

A molecule composed of eight monomer units bound to each other, usually in a linear array; as, an octamer formed from eight nucleotides is called an octanucleotide.

octamerous

Having the parts in eights; as, an octamerous flower; octamerous mesenteries in polyps.

Octameter

A verse containing eight feet; as, --/ / Deep/ in|to/ the | dark/ness | peer/ing, | long/ I | stood/ there | wond'/ring, | fear/ing.

Octandria

A Linnaean class of plants, in which the flowers have eight stamens not united to one another or to the pistil.

octane

Any one of a group of metametric hydrocarbons (C8H18) of the methane (paraffin) series. The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of gasoline or ligroin.

Octant

The eighth part of a circle; an arc of 45 degrees.

octanucleotide

A molecule composed of eight nucleotide units bound to each other by phosphodiester bonds in a linear array; as, a partial digest of DNA or RNA may include octanucleotides. See octamer.

octapeptide

A molecule composed of eight amino acid units bound to each other by peptide bonds, usually in a linear array. See octamer.

Octapla

A portion of the Old Testament prepared by Origen in the 3d century, containing the Hebrew text and seven Greek versions of it, arranged in eight parallel columns.

Octateuch

A collection of eight books; especially, the first eight books of the Old Testament.

Octavalent

Having a valence of eight; capable of being combined with, exchanged for, or compared with, eight atoms of hydrogen; -- said of certain atoms or radicals.

Octave

Consisting of eight; eight.

Octavo

Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.

Octennial

Happening every eighth year; also, lasting a period of eight years.

octet

A composition for eight parts, usually for eight solo instruments or voices.

Octic

Of the eighth degree or order. A quantic of the eighth degree.

Octillion

According to the French method of numeration (which method is followed also in the United States) the number expressed by a unit with twenty-seven ciphers annexed. According to the English method, the number expressed by a unit with forty-eight ciphers annexed. See Numeration.

Octoate

A salt of an octoic acid; a caprylate.

October

The tenth month of the year, containing thirty-one days.

Octocerata

A suborder of Cephalopoda including Octopus, Argonauta, and allied genera, having eight arms around the head; -- called also Octopoda.

Octodecimo

A book composed of sheets each of which is folded into eighteen leaves; hence; indicating more or less definitely a size of book, whose sheets are so folded; -- usually written 18mo or 18/, and called eighteenmo.

Octodont

Of or pertaining to the Octodontidae, a family of rodents which includes the coypu, and many other South American species.

Octofid

Cleft or separated into eight segments, as a calyx.

Octogild

A pecuniary compensation for an injury, of eight times the value of the thing.

Octogynia

A Linnaean order of plants having eight pistils.

Octoic

Pertaining to, derived from, or resembling, octane; -- used specifically, to designate any one of a group of acids, the most important of which is called caprylic acid.

Octonaphthene

A colorless liquid hydrocarbon of the octylene series, occurring in Caucasian petroleum.

Octonary

Of or pertaining to the number eight.

Octopede

An animal having eight feet, as a spider.

Octopoda

Same as Octocerata. Same as Arachnida.

Octopus

A genus of eight-armed cephalopods, including numerous species, some of them of large size. See Devilfish.

Octoroon

The offspring of a quadroon and a white person; a mestee.

Octostyle

Having eight columns in the front; -- said of a temple or portico. The Parthenon is octostyle, but most large Greek temples are hexastyle. See Hexastyle. An octostyle portico or temple.

octothorpe octothorp

A typographic symbol (#) having two vertical lines intersected by two horizontal lines. It is also called the crosshatch, hash, numeral sign and number sign; in the U. S. it is commonly called the pound sign, especially to designate the symbol as used on digital telephone dials, but this can be confusing to Europeans who think of the pound sign as the symbol for the British pound. It is commonly used as a symbol for the word number; as in #36 (meaning: number thirty-six).

Octoyl

A hypothetical radical (C7H15.CO.), regarded as the essential residue of octoic acid.

Octroi

A privilege granted by the sovereign authority, as the exclusive right of trade granted to a guild or society; a concession.

Octyl

A hypothetical hydrocarbon radical regarded as an essential residue of octane, and as entering into its derivatives; as, octyl alcohol.

Octylene

Any one of a series of metameric hydrocarbons (C8H16) of the ethylene series. In general they are combustible, colorless liquids.

Octylic

Pertaining to, derived from, or containing, octyl; as, octylic ether.

Ocular

The eyepiece of an optical instrument, as of a telescope or microscope.

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